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  <title>Document</title>
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  <script>
    //展开运算符 [1,2,3]=>3,2,1 剩余参数 1,2,3=>[1,2,3]
    const add=(...args)=>{
      console.log(args);
      console.log(...args);
    }
    add(1,2,3)
    console.log(...[1,2,3,[4]]);
  </script>
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